My ex filed my taxes without my permission how do i find out
You need to report it to the IRS as soon as possible. You can get complete details through the following... http://www.irs.gov/uac/Taxpayer-Guide-to-Identity-TheftYou can also call the police and have him arrested and charged with Identity Theft.
To find out if your ex filed your taxes, visit a nearby revenue office and ask for your records or you can even go online and check from your account. Any recent or past filling will always be recorded.
If you KNOW that your ex filed taxes without permission and with your name on them, then you need to call the IRS to have it worked out. Sephira called that one.
Did your ex sign your name on the tax forms? If so, that's a Federal offense. Notify the IRS of the fraud and file your own taxes soon.